If infatuation and love are different, then I think that a person would have to know (and be able to recognize) both infatuation and love in order to determine if a person was experiencing one or the other. Maybe somebody who knows both could help the infatuated person come to see that they were actually just infatuated and not in true love. However, if somebody only knows infatuation, I think it would be hard for them to know what love really is until they experience it.